Weed Veez
Weed trading has a very large number in the United States. This paper attempts to explore the trends and influencing factors of weed transactions through changes in the price of weed (high,medium and low quality) in the US states in 2014-2017. 
1 Comparison of weed transaction prices in US states in 2014
First, let’s take a look at the weed prices of the states in 2014 (three different qualities)
Maybe the query form is not intuitive enough? So let’s take a look at lollipop
Obviously, there is a large gap between the states’ cannabis prices, which may be due to the laws of the states and the average income of the residents. . . 
2 Weed price trends (2014-2017)
Well, we all know that the legal restrictions on cannabis are gradually relaxed after 2014, so can the trend of price reflect the previous conjecture of impact factors?(Take Washington as an example)
It can be seen that the price of cannabis（weed) is generally on the rise.
Maybe Washington is a special case? Look again at Nevada！
The price increase here is more obvious. 
3 Comparison of different quality prices of cannabis in different states（High, Low, Medium)
It can be seen that the price of low quality cannabis is close to always, and the higher the quality, the greater the price difference.
Therefore, we can make a reasonable inference: the premium attached to the price of cannabis is proportional to the quality.
4 Violin chart
Finally, we look at the deviation of the cannabis price in the same state through the violin map.
